Alison = 1 unit ($89), Mary = 4 units, Susan = 5 units. Altogether that is 1 + 4 + 5 = 10 units.<br><br>[[model:questions/solutions/q3196.png]]<br><br>• Total = 10 units → 10 × $89 = $890<br><br>Altogether the three girls have $890.<br>Check: $89 + $356 + $445 = $890. ✓